The Sigma DP2 has apparently been released into the wild...B&H is listing it as "Out of Stock" (doesn't that mean it had to be "In Stock" for a while?), and Amazon is listing it as available through 47th Street Photo, albeit for $50 more. Adorama says "Not in stock yet."
It's still possible that nobody's actually shipping it yet.
Let's Go Digital has some nice shots showing what the camera looks like, as well as some gee-whiz samples you're especially going to like if you happen to have a thing for big rigs. Most of the online samples I've seen so far look pretty darned impressive.
And wait, there's more...Check this out. Woo-hoo! Due out in early June. Jason is a veteran camera collector and was for many years the Editor of Popular Photography & Imaging when the late Burt Keppler was publishing director. Should be good.